Pseudo Philo Biblical Antiquities 32:4
4 And when his father had offered him upon the altar and had bound his feet to slay him, the Most Mighty hasted and sent forth his voice from on high saying: Kill not thy son, neither destroy the fruit of thy body: for now have I showed forth myself that I might appear to them that know me not, and have shut the mouths of them that always speak evil against thee. And thy memorial shall be before me for ever, and thy name and the name of this thy son from one generation to another.
Augustine City of God 11.32On the City of God Against the Pagans
Among other things, of which it would take too long time to mention the whole, Abraham was tempted about the offering up of his well-beloved son Isaac, to prove his pious obedience, and so make it known to the world, not to God. Now every temptation is not blame-worthy; it may even be praise-worthy, because it furnishes probation. And, for the most part, the human mind cannot attain to self-knowledge otherwise than by making trial of its powers through temptation, by some kind of experimental and not merely verbal self-interrogation;
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